Sometimes an allele that has no phenotypic effect can spread through a population by means of
a. a selective sweep
b. genetic recombination
c. disruptive selection
d. frequency-dependent selection
e. directional selection
A
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Accommodation involves the ability to
a. change the sensitivity of the rods and cones by means of neurotransmitters. b. change the curvature of the cornea. c. change the thickness of the lens by contracting or relaxing certain muscles. d. adapt to large changes in light intensity. e. do all of these.
Sharks that are __________ incubate their eggs in the uterus
a. oviparous b. viviparous c. ovoviviparous d. placental e. eutherial
The ____ is a functional region found in certain proteins that are important in development. It consists of sixty amino
acids that form four helices. a. homeobox b. homeodomain c. homeogene d. homeochromosome e. functional group
The exoskeleton of early marine arthropods can be considered a "pre-adaptation" for life on land because it
A) resisted water loss. B) absorbed light. C) protected against predators. D) reflected ultraviolet radiation.